DIY History | Transcribe | Scholarship at Iowa | Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898 | Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 89

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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 89

[page]88.[/page]

incurved; a broad shallow sinus corresponding to ridge on the other valve. This valve bears long stout erect spines.
     Surface marked by irregular costae which on some specimens become lost on the umbo; also marked by indistinct concentric lines of growth.
Geol. Pos. Missouri Stage, Upper Carboniferous.
Localities.-- Dallas, Madison, and other counties in Iowa; also in Illinois, Missouri, Kansas, and Nebraska.
Ref.-- Final Rept. U. S. Geol. Sur. of Nebraska.

[underlined]Productus cora[/underlined], d'Orbigny.
Plate VII. figure 4.

     d'Orbigny, 1843, Voyage dans l'Amerique Meridianale. 
     This species has been referred as follows:-- by Hall to P. Semireticulatus, 1852; by Norwood and Pratten to P. prattenianus and Phildrethianus, 1854; by Shumard to P. aequicostatus,

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[page]88.[/page] incurved; a broad shallow sinus corresponding to ridge on the other valve. This valve bears long stout erect spines. Surface marked by irregular costae which on some specimens become lost on the umbo; also marked by indistinct concentric lines of growth. Geol. Pos. Missouri Stage, Upper Carboniferous. Localities.-- Dallas, Madison, and other counties in Iowa; also in Illinois, Missouri, Kansas, and Nebraska. Ref.-- Final Rept. U. S. Geol. Sur. of Nebraska. [underlined]Productus cora[/underlined], d'Orbigny. Plate VII. figure 4. d'Orbigny, 1843, Voyage dans l'Amerique Meridianale. This species has been referred as follows:-- by Hall to P. Semireticulatus, 1852; by Norwood and Pratten to P. prattenianus and Phildrethianus, 1854; by Shumard to P. aequicostatus,